メタデータ
| 項目 |
値 |
| Designation |
P/2009 Q5 (McNaught) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2009-09-08T13:50:29.091840Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:34Z |
| Obs used |
331 |
| NEO |
- |
| M1 |
13.100 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2009-10-09.0000000 |
| e |
0.60905285 |
| q (au) |
2.918512 |
| a (au) |
7.465233 |
| i (deg) |
40.904822 |
| Ω (om, deg) |
160.139864 |
| ω (w, deg) |
209.274918 |
| M (ma, deg) |
1.470093 |
等級
散乱 + 全体線形
$$
M_a = (12.634 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.634 |
| n |
2.000 |
| gf |
0.974 |
| gb |
-1.000 |
| k |
0.999 |
| δ90 |
9.888 |
| パラメータ |
記号 |
範囲 |
説明 |
| 太陽・地球距離が1 AUのときの絶対等級 |
H0 |
-5 to 20 |
彗星の固有の明るさ |
| 測光スロープパラメータ |
n |
2 to 6 |
太陽距離に対する明るさ変化率 |
| 前方散乱非対称係数 |
gf |
0.8 to 1 |
前方散乱の強さ |
| 後方散乱非対称係数 |
gb |
-1 to -0.5 |
後方散乱の強さ |
| 分配係数 |
k |
0.8 to 1 |
前方/後方散乱の寄与比 |
| ダスト/ガス明るさ比 |
δ90 |
1 to 10 |
ダスト散乱とガス放射の相対寄与 |
参考: EPSC-DPS2025-160
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
15:36:55.65 |
+23:01:00.4 |
HIP 76506 |
17.08 |
| 2026-07-29 12:00 |
15:36:54.24 |
+22:58:51.0 |
HIP 76506 |
19.15 |
| 2026-07-30 00:00 |
15:36:52.96 |
+22:56:40.9 |
HIP 76506 |
21.24 |
| 2026-07-30 12:00 |
15:36:51.81 |
+22:54:30.3 |
HIP 76506 |
23.34 |
| 2026-07-31 00:00 |
15:36:50.78 |
+22:52:19.0 |
HIP 76580 |
24.68 |
| 2026-07-31 12:00 |
15:36:49.89 |
+22:50:07.2 |
HIP 76580 |
23.89 |
| 2026-08-01 00:00 |
15:36:49.12 |
+22:47:54.7 |
HIP 76580 |
23.26 |
| 2026-08-01 12:00 |
15:36:48.49 |
+22:45:41.8 |
HIP 76533 |
21.77 |
| 2026-08-02 00:00 |
15:36:47.98 |
+22:43:28.2 |
HIP 76533 |
20.20 |
| 2026-08-02 12:00 |
15:36:47.60 |
+22:41:14.1 |
HIP 76533 |
18.74 |
| 2026-08-03 00:00 |
15:36:47.36 |
+22:38:59.5 |
HIP 76533 |
17.41 |
| 2026-08-03 12:00 |
15:36:47.24 |
+22:36:44.3 |
HIP 76533 |
16.25 |
| 2026-08-04 00:00 |
15:36:47.25 |
+22:34:28.6 |
HIP 76533 |
15.30 |
| 2026-08-04 12:00 |
15:36:47.39 |
+22:32:12.4 |
HIP 76533 |
14.62 |
| 2026-08-05 00:00 |
15:36:47.66 |
+22:29:55.7 |
HIP 76533 |
14.24 |
| 2026-08-05 12:00 |
15:36:48.06 |
+22:27:38.6 |
HIP 76533 |
14.18 |
| 2026-08-06 00:00 |
15:36:48.59 |
+22:25:20.9 |
HIP 76533 |
14.47 |
| 2026-08-06 12:00 |
15:36:49.25 |
+22:23:02.8 |
HIP 76533 |
15.08 |
| 2026-08-07 00:00 |
15:36:50.04 |
+22:20:44.2 |
HIP 76533 |
15.98 |
| 2026-08-07 12:00 |
15:36:50.96 |
+22:18:25.1 |
HIP 76533 |
17.13 |
| 2026-08-08 00:00 |
15:36:52.00 |
+22:16:05.6 |
HIP 76533 |
18.49 |
| 2026-08-08 12:00 |
15:36:53.18 |
+22:13:45.7 |
HIP 76533 |
20.01 |
| 2026-08-09 00:00 |
15:36:54.49 |
+22:11:25.4 |
HIP 76533 |
21.67 |
| 2026-08-09 12:00 |
15:36:55.93 |
+22:09:04.6 |
HIP 76515 |
20.03 |
| 2026-08-10 00:00 |
15:36:57.50 |
+22:06:43.5 |
HIP 76515 |
17.82 |
| 2026-08-10 12:00 |
15:36:59.20 |
+22:04:22.0 |
HIP 76515 |
15.63 |
| 2026-08-11 00:00 |
15:37:01.03 |
+22:02:00.1 |
HIP 76515 |
13.48 |
| 2026-08-11 12:00 |
15:37:02.98 |
+21:59:37.8 |
HIP 76515 |
11.41 |
| 2026-08-12 00:00 |
15:37:05.07 |
+21:57:15.2 |
HIP 76515 |
9.48 |
| 2026-08-12 12:00 |
15:37:07.29 |
+21:54:52.2 |
HIP 76515 |
7.79 |
| 2026-08-13 00:00 |
15:37:09.63 |
+21:52:28.9 |
HIP 76515 |
6.56 |
| 2026-08-13 12:00 |
15:37:12.11 |
+21:50:05.3 |
HIP 76515 |
6.09 |
| 2026-08-14 00:00 |
15:37:14.71 |
+21:47:41.3 |
HIP 76515 |
6.56 |
| 2026-08-14 12:00 |
15:37:17.45 |
+21:45:17.1 |
HIP 76515 |
7.80 |
| 2026-08-15 00:00 |
15:37:20.31 |
+21:42:52.6 |
HIP 76515 |
9.54 |
| 2026-08-15 12:00 |
15:37:23.30 |
+21:40:27.8 |
HIP 76515 |
11.55 |
| 2026-08-16 00:00 |
15:37:26.42 |
+21:38:02.8 |
HIP 76538 |
13.24 |
| 2026-08-16 12:00 |
15:37:29.66 |
+21:35:37.4 |
HIP 76538 |
10.77 |
| 2026-08-17 00:00 |
15:37:33.04 |
+21:33:11.9 |
HIP 76538 |
8.31 |
| 2026-08-17 12:00 |
15:37:36.54 |
+21:30:46.1 |
HIP 76538 |
5.91 |
| 2026-08-18 00:00 |
15:37:40.17 |
+21:28:20.1 |
HIP 76538 |
3.70 |
| 2026-08-18 12:00 |
15:37:43.92 |
+21:25:53.9 |
HIP 76538 |
2.36 |
| 2026-08-19 00:00 |
15:37:47.80 |
+21:23:27.4 |
HIP 76538 |
3.29 |